nickerlias Posted March 30, 2005 Report Share Posted March 30, 2005 My bike came with an NGK type R plug in it. Does anyone know the difference to a standard BP5ES? What plugs are you all using? Quote Link to comment Share on other sites More sharing options...
stewart3871 Posted March 30, 2005 Report Share Posted March 30, 2005 i just use the BP5ES, as recommended by chris at John Lampkins. Quote Link to comment Share on other sites More sharing options...
james111089 Posted March 30, 2005 Report Share Posted March 30, 2005 The resistor is just another thing to make the plug go wrong better of with out them! James Quote Link to comment Share on other sites More sharing options...
subira Posted March 30, 2005 Report Share Posted March 30, 2005 The manual states a NGK BPR5 ES, so why not use that one ? I've been using the BPR5 EIX with the iridium centre electrode, works well. Quote Link to comment Share on other sites More sharing options...
gasgas Posted March 30, 2005 Report Share Posted March 30, 2005 Day before yesterday i rode my crossbike with a BP7ES plug. When revving it just died completely Put in the recommended BP R 7ES and problem solved. The digital ignition didn't like the non-R plug and just cutt out of electricity. Something to do with the transitor picking up wrong signals..... With the resistor plug this is solved. So try revving yr trialsbike like i did my crossbike and maybe you will notice a difference Quote Link to comment Share on other sites More sharing options...
ginger_ninja54 Posted March 30, 2005 Report Share Posted March 30, 2005 a BP5ES plug, and a BP5RES plug will be identical in heat range, electrode size etc. the 'R' simply stands for resistor. this resisitor cuts out interference to tv's, radio's etc. manufacturers are obligated to recommend resistor type plugs, but in reality, it won't make a blind bit of difference to your bike. Buying a BP5ES from a bike shop will prob cost about 3quid, but as it's used in Mini's, my local AutoComponents place do them for 1.60. Quote Link to comment Share on other sites More sharing options...
ginger_ninja54 Posted March 30, 2005 Report Share Posted March 30, 2005 D'oh! Re-read post, do you mean a NGK-R rather than a BP5RES/BP5ES? If so, i think a NGK-R type plug is a 'stronger' plug, as in it will stand up to higher heat ranges and to shock. Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted March 30, 2005 Report Share Posted March 30, 2005 I have a BP5EVX which works real well in the Sherco. Quote Link to comment Share on other sites More sharing options...
kevin j Posted March 31, 2005 Report Share Posted March 31, 2005 I would not say R plugs make no difference at all. Martin Belair (US Montesa importer) had a post in past that the Montessas for sure needed R plugs to make ignitions work right. I have no info on other brands. k Quote Link to comment Share on other sites More sharing options...
heathy Posted April 3, 2005 Report Share Posted April 3, 2005 I found this pic somewhere (can't remember where) which explains what every letter and number means on the spark plug Quote Link to comment Share on other sites More sharing options...
geomoney Posted April 4, 2005 Report Share Posted April 4, 2005 First post on this site, so go easy on me. I'll share a personal experience that occurred recently to me. I had (sold it to get an 05) a 02 Pro, and it suddenly developed a severe off idle hesitation that it never had before. The hesitation would occur when attempting heavy throttle/clutch slipping areas, such as a rock face. I went down the whole list.....carb clean, jetting, changed the petcock, cleaned the tank, checked the reeds, checked compression, air filter, exhaust sealing, etc etc. I was baffled until I remembered to go back and recheck for anything I may have overlooked. That's when I remembered when cleaning up in the garage I had come across a few brand new non-resistor plugs that were identical to what was in the bike...except for the fact of being non resistor (BP5ES I believe). I didn't think it would have any effect, but I put a resistor plug back in the bike. It was actually the old one I had taken out to begin with. If it wasn't my own experience in dealing with the whole issue, I myself wouldn't believe it would have such an effect. The off idle hesitation was gone. I thought that perhaps the suspect non resistor plug may have been fouled, so I put in another brand new non resistor plug. Hesitation returns. Put back the old resistor plug, bike ran excellent. If I tried to technically explain why it had such an adverse effect, I'd be making it up. I don't know, but I would have to believe it would have to be along the lines of ignition interference with the engine under load. So for what it's worth, in my own personal experience, I would say it does have an effect when using a non resistor plug. You may just not notice it based on how and where you ride. Quote Link to comment Share on other sites More sharing options...
jtt Posted April 5, 2005 Report Share Posted April 5, 2005 Don't worry geomoney, your not mad....it's been documented to happen in many cases on many different machines. You can get away with non-resistor plugs in some applications, but not all. Better to stick with the manufacturer's recommendation. There's no gain to be had from non-resistor plugs. Quote Link to comment Share on other sites More sharing options...
charliechitlins Posted April 5, 2005 Report Share Posted April 5, 2005 Yup...certain ignitions are designed to use a resistor plug and some aren't. Whichever one you've got, it doesn't pay to run the other kind of plug. Did that make sense? Quote Link to comment Share on other sites More sharing options...
jools Posted April 5, 2005 Report Share Posted April 5, 2005 My first post! oo er You are supposed to use NGK BPR 5ES, copper core ones r good Personaly, I am using Splitfire on me 300 and it runs a treat Quote Link to comment Share on other sites More sharing options...
gasgas Posted April 7, 2005 Report Share Posted April 7, 2005 Geomoney, read mine post, above, same deal. You are not alone Quote Link to comment Share on other sites More sharing options...
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